湖南稻米镉和土壤镉锌的关系分析

在湖南省采集108组稻米和土壤样品,测定稻米镉、土壤总镉、土壤有效态镉含量和有效态锌含量。电感耦合等离子体质谱法测定结果表明,稻米镉含量范围为0.015~1.05 mg/kg,平均值为0.272 mg/kg,其中超过70%的稻米样品镉含量在0.10~0.30 mg/kg范围内。土壤总镉、有效态镉、有效态锌含量范围分别为0.180~1.89、0.116~0.742、0.893~17.37 mg/kg,平均值分别为0.679、0.295、5.02 mg/kg。SPSS软件统计结果显示,稻米镉含量与土壤总镉和土壤有效态锌含量分别呈开口向上和开口向下的二次曲线关系(P=0.000),而与土壤有效态镉含量呈正相关(P=0.000)。以上结果表明,稻米镉含量受到土壤有效态镉含量的促进,土壤中有效态锌含量高可抑制稻米对镉的积累。

Relationship between Cd and Zn in Soil and Cd in Rice Grain

In this study, 108 groups of rice grain and soil samples from Hunan province were collected for analysis
of Cd content in rice grain, and the contents of total and available Cd and available Zn in soil by inductively coupled
plasma mass spectrometry (ICP-MS). The results showed that the Cd contents in rice grain were in the range of 0.015–
1.05 mg/kg, with an average of 0.272 mg/kg, and over 70% of the rice samples were in the range of 0.10–0.30 mg/kg. The ranges
of total and available Cd, and available Zn in soil were 0.180–1.89, 0.116–0.742, and 0.893–17.37 mg/kg, with average values of
0.679, 0.295, and 5.02 mg/kg, respectively. The statistical analysis by SPSS software showed that the content of Cd in rice grain
showed an upward opening quadratic curve relationship with the content of total Cd in soil and presented a downward opening
quadratic curve relationship with the content of available Zn in soil (P = 0.000). However, it was positively correlated with the
content of available Cd in soil (P = 0.000). The results showed that Cd content in rice grainwas increased by the available Cd
content in soil, but high concentrations of available Zn in soil restricted accumulation of Cd in rice grain.